The patch titled
spi_mpc83xx: add small delay after asserting chip-select line
has been added to the -mm tree. Its filename is
spi_mpc83xx-add-small-delay-after-asserting-chip-select-line.patch
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------------------------------------------------------
Subject: spi_mpc83xx: add small delay after asserting chip-select line
From: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
This is needed for some underlaying GPIO controllers that may be a bit
slow, or if chip-select signal need some time to stabilize.
For what it's worth, we already have the similar delay for chip-select
de-assertion case.
Signed-off-by: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
Cc: Kumar Gala <galak@xxxxxxxxxxxxxxxxx>
Cc: David Brownell <david-b@xxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi_mpc83xx.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff -puN drivers/spi/spi_mpc83xx.c~spi_mpc83xx-add-small-delay-after-asserting-chip-select-line drivers/spi/spi_mpc83xx.c
--- a/drivers/spi/spi_mpc83xx.c~spi_mpc83xx-add-small-delay-after-asserting-chip-select-line
+++ a/drivers/spi/spi_mpc83xx.c
@@ -383,8 +383,10 @@ static void mpc83xx_spi_work(struct work
break;
}
- if (cs_change)
+ if (cs_change) {
mpc83xx_spi_chipselect(spi, BITBANG_CS_ACTIVE);
+ ndelay(nsecs);
+ }
cs_change = t->cs_change;
if (t->len)
status = mpc83xx_spi_bufs(spi, t);
_
Patches currently in -mm which might be from avorontsov@xxxxxxxxxxxxx are
linux-next.patch
mpc52xx_psc_spi-convert-to-cs_control-callback.patch
spi_mpc83xx-handle-other-freescale-processors.patch
spi_mpc83xx-quieten-down-the-requested-speed-is-too-low-message.patch
spi_mpc83xx-add-small-delay-after-asserting-chip-select-line.patch
powerpc-86xx-add-mmc-spi-support-for-mpc8610hpcd-boards.patch
spi_mpc83xx-fix-checkpatch-issues.patch
spi_mpc83xx-split-mpc83xx_spi_work-into-two-routines.patch
spi_mpc83xx-remove-dead-code.patch
spi_mpc83xx-rename-spi_83xxc-to-spi_8xxxc.patch
spi_mpc8xxx-s-83xx-8xxx-g.patch
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